问题
解答题
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答案
(1)295+37+63,
=295+(37+63),
=295+100,
=395;
(2)630÷42,
=630÷(7×6),
=630÷7÷6,
=90÷6,
=15;
(3)238+402,
=238+400+2,
=638+2,
=640;
(4)15×28×2,
=(15×2)×28,
=30×28,
=840;
(5)18×35,
=9×2×35,
=9×(2×35),
=9×70,
=630;
(6)25×32×125,
=25×(4×8)×125,
=(25×4)×(8×125),
=100×1000,
=100000.